>>44114568I'm a little hesitant to believe this one. If memory serves, he had other dialogue that talks about other anniversaries (including gold and silver).
On top of that including hm dive in gen 5 had a lot of people convinced gen 3 remakes would occur within the same generation. There's references to other Pokemon games in every generation. When a remake is confirmed, everyone jumps on these references and suggest it was foreshadowing.
As a result, the only legit foreshadowing I see in the games is the strange souvenir in gen 6 and the Galar maps in Kanto.